Punch ejector die



March 5, 1935. s. SINGER PUNCH 'EJECTOR DIE Filed Dec. so, 1935 PatentedMar. 5, 1935 UNITED STATES PATENT OFFICE PUNCH EJECTORYDIE SamuelSinger, Philadelphia, Pa. Application December 30, 1933, Serial No.704,692 1 Claim. (01. 164-124) My invention relates to punch ejectordies. The object is to provide a die so formed as to f acilitate thedischarge of the cuttings without the possibility of clogging.

The invention comprises a hollow punching die associated with asupporting element having a channel in communication with the passagethrough the die, said channel being so formed and disposed as to receivethe cuttings from the die and to discharge said cuttings withoutpossibility of clogging.

Referring to the drawing, which illustrates merely by way of examplesuitable means for the embodiment of my invention:

Fig. 1 is a view in perspective of the die and supporting block.

Fig. 2 is a vertical section of the same.

Fig. 3 is a fragmentary section showing, more or less diagrammatically,the method of operation.

Similar numerals refer to similar parts throughout the several views.

In the example shown, the block 5 is of rectangular form provided with aboss 6 having a bore '7 for receiving the die 8 which is hollow; theinterior walls of the die tapering from the base to the outer cuttingedge 9. The die is secured within the bore '7, in any well known way,with its base abutting the annular flange 10. Beyond the flange 10 achannel 11 is provided in the block. This channel extends longitudinallywith straight, substantially parallel side walls and curved end walls.The upper end wall 12 extends above or beyond the margin of opening 13in flanged part 10 of the block, for the purpose herein to be described.Between the boss 6 and the lower end wall 14 is provided the dischargeopening 15.

The device comprising the die with its supporting block, is adapted tobe mounted and operated in the usual way in connection with a suitablepress.

In operation the material such as card board, leather, or the like,sheets are punched by being pressed against the cutting edge 9 of thedie 8. The cuttings or wads 16 accumulate in the bore of the die andmove progressively toward the passage 13 in the annular flange 10, witheach successive punching operation. The pressure created by eachsuccessive cutting or wad that enters the die and is crowded upon thosein advance of it, will tend to compact the cuttings sov that, as thesame pass through the opening 13, some of the cuttings may adheretogether and the advance To overcome this difliculty as well as others,I'

have found that the discharging operation is facilitated by providing asubstantial spaceor clearance between the top of end wall 12 of thechannel 11, and the margin of the discharge opening, such as 13,combined with the curved formation of the top wall as at 12. In thefirst place the cutting, after passing the margin of orifice 13, is freeto fall immediately, if not adherent to an adjacent cutting, because ithas encountered no obstruction.

If, on the contrary, the cuttings should adhere or stick together, theywill, as they advance, encounter the smoothly curved top wall 12. Bycause of this engagement, there is created a force acting upon theadvancing cuttings, which is inclined to the original path of theirtravel. Thus the cuttings are caused to slide one upon another, andautomatically separate from each other, to be discharged through opening15, as indicated in Fig. 3.

It is especially important, whether the cuttings separated freely ornot, that the cutting shall not encounter any obstacle to its forwardmovement, until it has entirely cleared the margin of the opening 13,since otherwise the free passage of the cuttings through the die isobstructed. For this reason the top of the upper curved wall 12 iscarried well above and spaced from the margin of the annular flange 10.

What I claim is:-

The combination of a block having a boss at one end thereof andprojecting above thefmain body of the block, said block provided with alongitudin'ally extending channel having an outwardly curved wall ateach end, the boss provided with a bore having its axis at right angleswith SAMUEL SINGER.

